Like all members of the genus Phalacrocorax, the double-crested cormorant is an expert fisherman. Their webbed feet, streamlined bodies and feathers that hold water reduce their buoyancy, making them expert diveers. They can stay underwater for up to 70 seconds, reaching depths of up to 7.5 m (21.5 ft). After diving, they stand with their wings spread wide as they dry.

Cormorants are found throughout North America, breeding in colonies on coastal lakes, ponds, slow-moving rivers, lagoons and estuaries. They nest in trees, on cliffs and rocky islands, or on pilings, piers, docks or other man-made structures near water. They can also build simple nests of sticks, twigs, branches and other materials. Pairs work together to repair old nests or construct new ones. They usually lay two to four pale blue or green eggs, which hatch in about a month. After a few weeks, young are able to fly and feed themselves. https://nestvui.com/yen-tho-loai-1-hop-50g/ may remain in their parents' nests for several years.

While solitary in winter, the double-crested cormorant flocks in summer as it migrates along coasts and river valleys. Some populations are permanent residents, but others are seasonal migrants; they leave the northeast in September and migrate south down the Atlantic coast and through the Mississippi and Missouri valleys. They return to their northern breeding grounds in late March or April.

In https://nestvui.com/to-yen-vun-tinh-che/ and early 1900s, these birds were persecuted and heavily hunted for sport and fur, contributing to their decline. They have since rebounded, however, aided by protection and the elimination of DDT and other pesticides. They are now abundant, with a continental population of 630,000, according to Partners in Flight. The bird is listed as having a low conservation concern.

Like other colonial waterbirds, cormorants can have negative impacts on vegetation at breeding and roosting sites through their normal nesting activities. The acidic guano they excrete changes soil chemistry and kills ground vegetation, and the weight of their large bodies and wings can damage trees and rip off leaves and branches, especially on sand spits and barrier beaches.

They can also cause significant alterations to wetland habitats by removing fish, birds and other invertebrates from shallow waters. In addition, their normal feeding behavior can disturb other wildlife.

As a result of their widespread distribution, the USFWS has implemented an Interim Depredation Order that allows states and tribes, along with the USDA's Wildlife Services, to take a limited number of cormorants under permit each year to alleviate depredations on public fish (including hatchery stocks at federal, state, tribal and private facilities), wildlife, plants and property, and risks to people. Depredation permits must be obtained from a local USDA Wildlife Service office.

In Texas, the first documented breeding record of this species was in 1926 on Matagorda Peninsula, and it was rare inland until 1974 and 1977 on Toledo Bend Reservoir-eastern Lower East Region (Wilbarger County). The species is now common at some coastal and inland reservoirs and other natural water bodies, but rarely nests in the populated areas.